Wow. The music is kinda neat (It has some kinda progression to it too) and it's synced to the fx. Is this the first 256b with music synced to visuals? Because I think it's a first. Still, really neato.

Hello,
1) "Blue square" glitch fixed -> Darnit!.fixed (256 bytes)
2) DOSBox compatible version added -> Darnit!.safe (259 bytes) is an alternate version for the sound and code are timely bound together hence resulting in notably differences.
You can also try it on XP SP3 too and consider it a bonus cleaner version.
3) A capture with dosbox-0.74.conf tested values (frameskip=1, aspect=false, scaler=normal2x, core=dynamic, cputype=pentium_slow, cycles=max) is available here but .mid and .avi are separated (my encoding skills stop here).
4) sensenstahl : thank you for the "Blue square" glitch remark. The rest of the glitches are "features" though. As for speed I run it on an Intel Core2 Duo 2GHz.
5) dex46... : thank you for pointing out correct version of DOSBox 0.74
6) TomoAlien : I don't know if this is the first 256b with music synced to visuals with a progression.
7) StingRay and TomoAlien : thank you for your compliments.